how to fix P0301 misfire code on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Tools: Socket set, ratchet, and extension.
  • Unplug the electrical connector and remove the mounting bolts.
• Remove the spark plug from cylinder 1 using a spark plug socket:
  • Inspect the spark plug for any signs of wear or fouling.
• If damaged, replace the spark plug with a new one:
  • Torque the new spark plug to manufacturer specifications (typically around 13 lb-ft).

3. Check and Replace Ignition Coil

• Inspect the ignition coil for signs of damage or wear.
• If defective, replace the ignition coil:
  • Tools: Socket set.
  • Install the new ignition coil and torque to specifications.
  • Reconnect the electrical connector.

4. Inspect and Test Fuel Injector

• Remove the fuel injector from cylinder 1:
  • Tools: Socket set, and possibly a fuel line removal tool.
  • Ensure to relieve fuel pressure before disconnection.
• Test the injector for proper operation using a multimeter or injector tester.
• Replace the injector if it fails the test:
  • Reinstall the new fuel injector and reconnect the fuel line.

5. Compression Test

• Perform a compression test on cylinder 1 to ensure it is within specifications (typically 180-200 psi).
• If compression is low, investigate further for potential issues such as valve problems or head gasket failure.